[ Picking battles wisely is one thing Spike is not great at. He can if he really puts his mind to it, but most of the time he ends up resorting to formless mayhem, punching and ripping and breaking whatever he can get his hands on. Let's not forget that he hasn't had much of a chance to sate his bloodlust in this inside-out fishbowl and we can all agree that while this may be a terrifying day for some... it's practically Christmas for him.
With red-hot blood comes glee comes territorial greed and when she shanks a raptor he was set to snack the neck of, he gets a little miffed. Understandable, yes? ]